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Umidigi phones not using LTE logo (as you called) but 4G. Also VoLTE logo will not appear because we not using this in our phones.
Please be in very strong signal strength and then prepare voice call, if 4G icon remain this will indicate that you are in VoLTE.
Also please check with network provider that the sim card is supporting VoLTE and that you no need special settings or different bundle.
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